Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca91267d0ba3325…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 02:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 973f8cc71c6b254e979894dc348a73c1 SHA-1: 446837d7a591c422ccf6d05b06a0d7b8e81556ce SHA-256: 7ca91267d0ba332531f947ee291c8e13f41cca610002e95fcd9b5bd6bdf945c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories and disposable hosting sites. The primary purpose appears to be directing users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://0900107678.com/upload/file/funaxom.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7c00rh210s01sn2mscvnausq3s/80346021595.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a143d151311---vunuzoloziriwixi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bdd9b21---9581349349.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/votegexalatuzulu.pdfIn PDF document text
    • http://dhf-china.com/d/files/9876793468.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/delomej.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/3163355232.pdfIn PDF document text
    • https://emmaushuis.org/pages/14868025393.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/kpaprh9tcdp7oe88q51lkhq76h/dexilig.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/muzebefodedita.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/36201683015.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/37567423913.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607789422176e---8060550028.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac5cb5b6af---dirinifawuvoxubelosid.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e560a2ac9---38950461753.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1gas154etivbknu2h7pq6n46t7/45259837656.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/21528741265.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b023045e0---35035088237.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/rigeterexavakofudonarej.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce671c3ff2---24692948920.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/56790079903.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/webowisalobi.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/mafiz.pdfIn PDF document text
    • https://linardi.ru/files/file/xekine.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f21f425e7a2d9ab248038ec584c29e87/47301980933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=convert+pdf+file+to+docx+free+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 10484 bytes
SHA-256: 6c039b4a6c419875f3693bba3f151e39a764bb4b9241f1f0a26fbf4cd9e24516
font_01_sfnt_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 16152 bytes
SHA-256: 99435d3a4087a31b35565341f66300b0726c3b394ca4509c97ff5d8b12e1cd9e
font_02_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1